adding root record id to an archival object summary

_archival_object.html.erb

<fieldset class="form-horizontal">
  <section id="summary">
    <h3><%= I18n.t("archival_object._public.section.summary") %></h3>
    <dl class="dl-horizontal">
      <%= label_and_value I18n.t("archival_object.component_id"), archival_object['component_id'] %>
      <%= label_and_value I18n.t("archival_object.level"), i18n_enum(:archival_object, 'level', archival_object['level']) %>
      <%= label_and_value I18n.t("archival_object.language"), i18n_enum(:archival_object, 'language', archival_object['language']) %>
      <%= label_and_value "Root Record ID", @tree_view["path_to_root"].first["id"] %>
    </dl>
  </section>

  <%= render_aspace_partial :partial => "dates", :locals => {:dates => archival_object['dates']} %>
  <%= render_aspace_partial :partial => "extents", :locals => {:extents => archival_object['extents']} %>
  <%= render_aspace_partial :partial => "agents", :locals => {:linked_agents => archival_object.published_agents} %>
  <%= render_aspace_partial :partial => "subjects", :locals => {:subjects => archival_object['subjects']} %>
  <%= render_aspace_partial :partial => "notes", :locals => {:notes => archival_object.published_notes} %>
  <%= render_aspace_partial :partial => "external_documents", :locals => {:external_documents => archival_object.published_external_documents} %>
  <%= render_aspace_partial :partial => "instances", :locals => {:instances => archival_object.published_instances} %>

  <%= render_aspace_partial :partial => "components", :locals => {
        :record_type => "archival_object",
        :root_uri => archival_object.uri,
      }
  %>

</fieldset>